当前位置: X-MOL 学术Urban Forestry Urban Green. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Functional adaptations and trait plasticity of urban trees along a climatic gradient
Urban Forestry & Urban Greening ( IF 6.4 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.ufug.2020.126771
Manuel Esperon-Rodriguez , Paul D. Rymer , Sally A. Power , Anthea Challis , Renée M. Marchin , Mark G. Tjoelker

Abstract In urban environments, long-term tree survival and performance requires physiological tolerance or phenotypic plasticity in plant functional traits. Knowledge of these traits can inform the likely persistence of urban forests under future, more severe climates. We assessed the plasticity of morphological and physiological traits of tree species planted along an urban climatic gradient in the Greater Sydney region during a severe, multi-year drought in eastern Australia. We selected four sites along a ∼55 km east-west transect, ranging from the cool/wet coast to the warm/dry inland. We assessed five tree species (four natives, one exotic) with different predicted climatic vulnerability based on climate-origins, estimating functional traits indicative of drought tolerance: carbon isotope composition (δ13C), Huber value (HV), specific leaf area (SLA), wood density (WD), and leaf turgor loss point (πtlp). Broadly, trees planted in warm/dry sites had more negative πtlp, higher WD, δ13C and HV, and lower SLA than cool/wet sites, indicating phenotypic plasticity to drought. The leaf-level traits πtlp, δ13C and SLA were more strongly correlated with temperature and precipitation, compared to HV and WD. Species differed in the extent of their trait shifts along the transect, with greater plasticity evident in the exotic Celtis australis and the more temperate cool-climate Tristaniopsis laurina, compared to the more tropical, warm-climate Cupaniopsis anacardioides, which showed limited plasticity and lower drought tolerance. Our findings reveal adaptive capacity of urban trees to climate via plasticity in drought tolerance traits, which can direct species selection to improve urban forests resistance to climate change.

中文翻译:

城市树木沿气候梯度的功能适应性和性状可塑性

摘要 在城市环境中,树木的长期生存和表现需要植物功能性状的生理耐受性或表型可塑性。了解这些特征可以告知城市森林在未来更恶劣的气候下可能会持续存在。我们评估了在澳大利亚东部严重的多年干旱期间沿着大悉尼地区城市气候梯度种植的树种的形态和生理特征的可塑性。我们沿着约 55 公里的东西向横断面选择了四个地点,从凉爽/潮湿的海岸到温暖/干燥的内陆。我们根据气候起源评估了具有不同预测气候脆弱性的五种树种(四种本地树种,一种外来树种),估计了指示耐旱性的功能性状:碳同位素组成 (δ13C)、胡贝尔值 (HV)、比叶面积 (SLA)、木材密度 (WD) 和叶膨胀损失点 (πtlp)。从广义上讲,在温暖/干燥地点种植的树木比凉爽/潮湿地点具有更多的负 πtlp、更高的 WD、δ13C 和 HV,以及更低的 SLA,表明对干旱的表型可塑性。与 HV 和 WD 相比,叶级性状 πtlp、δ13C 和 SLA 与温度和降水的相关性更强。物种沿横断面的性状变化程度不同,与更热带、温暖气候的 Cupaniopsis anacardioides 相比,外来的 Celtis australis 和更温和凉爽气候的 Tristaniopsis laurina 具有更大的可塑性,后者表现出有限的可塑性和较低的耐旱性。我们的研究结果通过耐旱性状的可塑性揭示了城市树木对气候的适应能力,
更新日期:2020-10-01
down
wechat
bug